深基坑支护变形与位移预测分析

发布时间：2018-05-09 00:42

本文选题：深基坑工程 + 灰色GM模型　；参考：《新疆农业大学》2016年硕士论文

【摘要】：一个城市地下空间开发利用的程度,在一定意义上,能反映这个城市经济发展的水平。随着我国大中型城市的不断崛起,近年来地下空间开发规模急速增长,深基坑工程数目骤增,与之相关的创新理论与实践不断完善。深基坑工程是一项理论与实践结合相当紧密的综合工程。本文研究对象为深基坑工程的变形,针对存在于深基坑工程现场监测和变形预测中的很多棘手问题,引入了灰色GM(l,l)模型法、灰色马尔科夫链模型法、BP神经网络模型法及灰色马尔科夫链-BP神经网络组合模型法,运用这些模型对施工过程中的深基坑支护变形预测技术进行了多方面的综合探讨,本文着重研究如下内容:(1)归纳总结了深基坑工程发展现状,在此基础上,总结了监测手段和监测控制的发展状况,对深基坑的监测手法和变形机理进行了较为系统的总结和论述,并阐述了深基坑支护结构的受力特点,经典土压力理论及其适用条件,与土压力相关的土体极限平衡理论。(2)引入灰色系统理论,灰色马尔科夫链理论、BP神经网络理论和集合3者优点的组合模型理论,建立了四种预测模型,分别讨论了每个模型的特点,和它们在工程变形预测中各自的适用性和优缺点。(3)利用这4种预测模型针对南航大厦深基坑工程,在开挖和后续工序的施工过程中,对基坑支护结构变形与位移展开预测,将预测结果与工地现场实测结果进行比对,验证预测结果是否对工地现场具有指导意义。
[Abstract]:The degree of development and utilization of underground space in a city, in a certain sense, can reflect the level of economic development of this city. With the continuous rise of large and medium-sized cities in China, the scale of underground space development has increased rapidly in recent years, the number of deep foundation pit projects has increased sharply, and the related innovative theory and practice have been continuously improved. Deep foundation pit engineering is a comprehensive project which combines theory with practice. The object of this paper is the deformation of deep foundation pit engineering. In view of many difficult problems existing in the field monitoring and deformation prediction of deep foundation pit engineering, the grey GMlLJ model method is introduced. Grey Markov chain model method and grey Markov chain-BP neural network combined model method are used to comprehensively discuss the deformation prediction technology of deep foundation pit support in the process of construction. This paper focuses on the following contents: 1) summarizes the development status of deep foundation pit engineering, and on this basis, summarizes the development of monitoring means and monitoring control. The monitoring technique and deformation mechanism of deep foundation pit are systematically summarized and discussed, and the stress characteristics, classical earth pressure theory and applicable conditions of deep foundation pit supporting structure are expounded. The limit equilibrium theory of soil mass related to earth pressure. (2) the grey system theory, the grey Markov chain theory and the BP neural network theory and the combination model theory with three advantages are introduced, and four kinds of prediction models are established. The characteristics of each model are discussed, and their applicability, advantages and disadvantages in engineering deformation prediction are discussed. The deformation and displacement of supporting structure of foundation pit are forecasted. The prediction results are compared with the measured results on the site to verify whether the prediction results are of guiding significance to the site.
【学位授予单位】：新疆农业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TU753

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